JP6847748B2 - Case mold type film capacitor - Google Patents

Description

The present invention relates to a film capacitor used for smoothing an inverter circuit or the like. Specifically, a film capacitor element in which a pair of electrode drawing metal electrodes are formed on both end surfaces, a capacitor main part consisting of an external drawing terminal electrically connected to each of the pair of metal electrodes, and an opening. An outer case that houses the main part of the capacitor except for a part of the external connection terminal part on the free end side of the external lead-out terminal, and a part of the external connection terminal part that is filled in the outer case and solidified. The present invention relates to a case-molded film capacitor provided with a mold resin that covers the main portion of the capacitor except for the above.

In the case-molded film capacitor having the above configuration, it is required to store the main part of the capacitor in the outer case and prevent the main part of the capacitor from rising when the mold resin is injected and filled into the outer case. If the main part of the capacitor is lifted in the outer case due to the buoyancy of the mold resin, the thickness of the mold resin covering the upper and lower parts of the outer periphery of the film capacitor element inside is excessive or insufficient. Further, if the positioning of the main part of the capacitor in the horizontal direction with respect to the outer case is unstable, the thickness of the mold resin covering the lateral side part of the outer periphery of the film capacitor element becomes excessive or insufficient. Such excess or deficiency of the thickness of the mold resin leads to deterioration of the moisture-proof performance of the film capacitor element.

In recent years, while there has been a demand for larger capacities for film capacitor elements, there has been an increasing demand for miniaturization of case-molded film capacitors. Therefore, the thickness of the mold resin becomes thin, and there is no margin in the thickness of the mold resin in order to secure reliability, and the positioning of the main part of the capacitor at the time of resin curing is becoming more important than before.

Conventionally, as a measure to prevent the main part of the capacitor from rising in the outer case during injection and filling of mold resin and to aim for horizontal positioning, a part of the vertical side plate of the outer case is cut out and cut out. By fitting a corresponding sealing plate into the notch portion of the vertical side plate, there is a configuration in which the external connection terminal portion protruding from the film capacitor element is sandwiched (see, for example, Patent Document 1). In Patent Document 1, there are two cases inside and outside, the inner resin case is called an inner case, the outer metal case is called an outer case, and the inner case is the main case of both the inner and outer cases. Please note that it corresponds to the exterior case referred to in the specification.

In this case, a positioning pin projecting upward from the bottom surface of the notch is fitted into a positioning hole of the external connection terminal portion, and the same positioning pin is further fitted into a positioning hole at the bottom of the sealing plate. Match. At the same time, the positioning pin projecting upward from the rising portion at the center of the notch is fitted into the positioning hole at the center of the bottom of the sealing plate.

JP-A-2010-182914

In the conventional case-molded film capacitor having the above configuration, the outer case is cut out to separate the case body with the cutout portion and the sealing plate, and both are fitted together. Then, a positioning pin is projected on the side of the notch portion, and a positioning hole is formed on the side of the sealing plate. Therefore, the structure of the outer case is complicated, and there is a possibility that the mold resin may leak out unless the mating boundary surface between the notch and the sealing plate is processed with high accuracy.

Further, in order to reliably prevent the main part of the capacitor from rising when the mold resin is injected and filled into the outer case, the following lifting prevention jigs have been conventionally used. That is, in the main part of the capacitor (consisting of the film capacitor element and the external lead-out terminals connected to the pair of metal electrodes of this element) to be housed in the outer case, the external connection terminal part on the free end side of the external lead-out terminal is prevented from floating. Connect the jigs. Then, the outer case is placed and fixed on the horizontal base, and the floating prevention jig to which the main part of the capacitor is connected is fixed to the horizontal base. When fixing the lift prevention jig to the horizontal base, the main part of the capacitor is housed in the outer case.

However, in the measures using such a lift prevention jig, the lift prevention jig requires not only the connection part of the external extraction terminal of the main part of the capacitor with the external connection terminal part but also the connection part with the horizontal base. , The lifting prevention jig itself becomes a very large scale. As a result, productivity deteriorated and manufacturing costs soared.

The present invention was created in view of such circumstances, and has a simple configuration in which the main part of the capacitor is lifted when the mold resin is injected and filled into the outer case while improving the productivity and reducing the manufacturing cost. The purpose is to ensure that it can be prevented.

The present invention solves the above problems by taking the following measures.

The case-molded film capacitor according to the present invention
A film capacitor element in which a pair of metal electrodes for drawing out electrodes are formed on both end surfaces, and a main part of a capacitor consisting of external drawing terminals electrically connected to each of the pair of metal electrodes.
An exterior case having an opening and accommodating the main part of the capacitor except for a part of the external connection terminal part on the free end side of the external lead-out terminal.
It is provided with a mold resin that is filled in the outer case and covers the main part of the capacitor except for a part of the external connection terminal part by solidification.
The exterior case is provided with a pedestal portion on which the external drawer terminal is placed and received, and a support pin projecting from the pedestal portion.
The external drawer terminal is provided with a plurality of holding tongue pieces that engage with the support pin and hold the outer peripheral surface of the support pin .
The outer case is open upward, and the pedestal portion extends perpendicularly to the surface direction of the vertical side plate from the upper portion of the vertical side plate constituting the opening peripheral surface of the outer case. has a base face, the support pins projecting from said base face upwards an opening direction of the outer case, the external lead terminals its underside Rukoto placed supported on the base face It is a feature.

According to the above configuration of the present invention, there are the following actions.

When the main part of the capacitor is housed in the outer case, the upper external lead-out terminal of the main part of the capacitor is placed and supported on the pedestal part of the outer case. At this time, the holding tongue piece provided in the external drawer terminal is engaged with the support pin protruding from the pedestal portion. As a result, the plurality of sandwiching tongue pieces sandwich the outer peripheral surface of the support pin. As a result, the external lead-out terminal on the upper side of the main part of the capacitor is fixed to the outer case in a strong anti-lifting state, and the positioning in the horizontal direction is surely performed.

Here, the mechanism (buoyancy prevention mechanism) that plays a role of preventing the buoyancy of the main part of the capacitor from the injection-filled mold resin is the support pins (plural) protruding from the pedestal part of the outer case. It is composed of a holding tongue piece provided on the external pull-out terminal so as to engage with the support pin in a holding state, and has a very simple structure to prevent lifting. That is, the large-scale lifting prevention jig used in the past is not required, the productivity of the case-molded film capacitor can be improved, and the manufacturing cost can be significantly reduced.

Such a lift prevention mechanism not only reliably prevents the floating of the main part of the capacitor due to the buoyancy of the mold resin in the outer case, but also strictly sets the height position of the external extraction terminal in the outer case to the specified height position. Demonstrate the function to match. As a result, the thickness of the resin covering the main part of the capacitor can be made constant, the variation in the moisture resistance performance can be suppressed, and the moisture resistance can be improved. In addition, the manufacturing tolerance of the resin thickness becomes sufficiently small, and as a result, it has an advantage in reducing the size of the capacitor.
Further, in the present invention, the outer case is open upward, and the pedestal portion is formed in the direction from the upper portion of the vertical side plate constituting the peripheral surface of the opening of the outer case to the surface direction of the vertical side plate. It has a vertically extended pedestal surface, the support pin is projected upward from the pedestal surface in the opening direction of the exterior case, and the lower surface of the external drawer terminal is placed on the pedestal surface. The configuration that it is supported has been added.
This configuration more specifically defines each configuration of the exterior case, the pedestal, and the support pin. That is, in the bottomed box-shaped exterior case, the top surface portion facing the bottom portion is in an open state. Further, a pedestal portion extending perpendicularly to the surface direction of the vertical side plate is formed from the upper portion of the vertical side plate constituting the bottomed box-shaped peripheral surface portion, and a support pin is formed on the pedestal surface which is the upper surface of the pedestal portion. Is projected upward. That is, the support pin is in a posture toward the opening direction of the outer case.
According to this, when the main part of the capacitor is accommodated through the opening from above the outer case and the external lead-out terminal in the main part of the capacitor is brought close to the pedestal part, the holding tongue piece provided in the external lead-out terminal is supported. It will engage with the pin. Immediately after this engagement, the external drawer terminal is placed and supported on the pedestal surface.
When the main part of the capacitor is housed in the outer case, each of the plurality of holding tongue pieces in the external pull-out terminal engages with and holds each support pin of the pedestal part, and at the same time, the outside of the external pull-out terminal is held in parallel with this. The protruding plate portion is placed and supported on the pedestal surface of the pedestal portion, and can be accommodated in a predetermined positional relationship and posture relationship with one touch, and the workability of accommodation is improved.
As a result, the attitude of accommodating the main part of the capacitor with respect to the outer case becomes as high as expected, and the stability is excellent and the dimensional relationship accuracy is also improved. In particular, it is possible to make the thickness of the resin covering the main part of the capacitor constant, suppress variations in moisture resistance performance, and improve moisture resistance. In addition, the manufacturing tolerance of the resin thickness becomes sufficiently small, and as a result, it has an advantage in reducing the size of the capacitor.

The case-molded film capacitor of the present invention having the above configuration has several preferable modes or changes / deformation modes as follows.

[ 1] The external drawer terminal is formed on a tongue piece-shaped extension plate portion in which a plate portion mounted and supported on the pedestal surface is integrally extended outward in the surface direction of the main body plate portion. There is an embodiment in which the sandwiched tongue piece is movably configured by a cutout around the sandwiched tongue piece in the tongue piece-shaped extension plate portion.

In this case, a plurality of sandwiched tongue pieces are movably formed by cutting out in the tongue piece-shaped extending plate portion integrally extending outward from the main body plate portion of the external drawer terminal in the surface direction of the main body plate portion. Each sandwiched tongue piece is deformable with respect to the tongue piece-shaped extension plate portion. That is, a plurality of sandwiched tongue pieces per support pin exhibit deformation of the tongue piece-shaped extension plate on which they stand, in addition to their own deformation, in other words, double deformation. It has a function. Therefore, it is possible to more reliably prevent the main part of the capacitor from being lifted by the resin buoyancy in the outer case.

[2] Further, the external drawer terminal has a first extending plate portion in which a plate portion mounted and supported on the pedestal surface is extended in the first direction, and a first extending plate portion orthogonal to the first direction. There is an aspect in which it has a second extension plate portion extending in two directions.
In this case, the direction of extension of the first pedestal surface on which the first extension plate portion is placed and supported, and the direction of extension of the second pedestal surface on which the second extension plate portion is placed and supported. Needless to say, corresponds to the mutual relationship (orthogonal relationship) between the extension direction of the first extension plate portion and the second extension plate portion. That is, the first fixed portion formed by the correspondence between the first extension plate portion and the first pedestal surface, and the second fixed portion formed by the correspondence between the second extension plate portion and the second pedestal surface. Are orthogonal to each other in the direction of their extension.
The first fixing portion extending in the first direction regulates the misalignment of the external extraction terminal in the second direction, and the second fixing portion extending in the second direction is the first fixing portion of the external extraction terminal. Regulate directional misalignment. Due to these collaborative actions, the position of the external lead-out terminal is surely regulated in both the first direction and the second direction, and the horizontal relative positional relationship of the film capacitor element with respect to the outer case is strictly defined. It becomes possible to match with.
As a result, the thickness of the mold resin covering the lateral side portion of the outer periphery of the film capacitor element is equalized, and the moisture-proof performance for the film capacitor element is improved.
[3] Further, there is an embodiment in which the plurality of sandwiched tongue pieces are configured in at least a pair or more in a state of facing each other while being separated from each other to such an extent that the support pins can be sandwiched. In this case, since the support pins are sandwiched by the sandwiching tongue pieces facing each other, the external drawer terminal can be reliably positioned and fixed to the outer case .

[4] Further, the plurality of sandwiched tongue pieces are configured such that two sets of the pair of sandwiched tongue pieces are orthogonal to each other. In this case, four sandwiching tongue pieces are formed so as to face each other from four sides orthogonal to each other toward the support pin, and the fixing of the external extraction terminal to the support pin and the pedestal portion is further strengthened.

According to the present invention, when the external drawer terminal is placed and supported on the pedestal portion of the outer case, a plurality of holding tongue pieces formed on the external drawer terminal are engaged with the support pins protruding from the pedestal portion. By sandwiching the support pin, the external drawer terminal is fixed in a strong anti-lifting state with a simple configuration, so it is possible to improve productivity and reduce costs by eliminating the need for a large-scale anti-lifting jig that has been used in the past. it can. Then, by surely preventing the main part of the capacitor from rising when the mold resin is injected and filled into the outer case, the thickness of the resin covering the main part of the capacitor is made uniform, the variation in the moisture resistance performance is suppressed, and the moisture resistance is improved. Can be planned. At the same time, the quality of the capacitor can be improved and the size can be reduced by making the manufacturing tolerance of the resin thickness sufficiently small.
Moreover, without hindering the connection between the metal electrode of the film capacitor element and the external lead-out terminal and the accommodation of the film capacitor element in the outer case, the pinch of the external lead-out terminal can be engaged with the support pin of the pedestal of the tongue piece. The plate portion of the external extraction terminal protruding outward is placed and supported on the pedestal surface at the same time, and highly accurate and stable accommodation can be realized by one-touch efficient work.

Perspective view showing the metallized film which is the source of the metallized film winding body in the 1st Example of this invention. Perspective view showing the middle of manufacturing of the columnar metallized film wound body in the first embodiment of the present invention. A cross-sectional view (a) of the film capacitor element in the first embodiment of the present invention and a perspective view (b) of the film capacitor element. A perspective view showing a film capacitor element unit according to the first embodiment of the present invention. A perspective view of a split state showing the film capacitor element unit and the lower external lead-out terminal in the first embodiment of the present invention. A perspective view of a split state showing the film capacitor element unit and the upper external lead-out terminal in the first embodiment of the present invention. A perspective view showing a main part of a capacitor in an assembled state according to the first embodiment of the present invention. A perspective view showing an enlarged view of a tongue piece-shaped extension plate portion and a sandwiched tongue piece in an external drawer terminal according to the first embodiment of the present invention. A perspective view showing a state in which the main part of the capacitor according to the first embodiment of the present invention is housed in an outer case. A perspective view showing a state in which the main part of the capacitor in the first embodiment of the present invention is housed in an outer case (the viewing direction is different from that in FIG. 9). A perspective view showing a fixed state of a support pin on a pedestal portion in an exterior case and a holding tongue piece in an external drawer terminal in the first embodiment of the present invention. A perspective view showing a state in which the mold resin is solidified in the outer case containing the main part of the capacitor in the first embodiment of the present invention. A perspective view showing an enlarged view of a tongue piece-shaped extension plate portion and a sandwiched tongue piece in an external drawer terminal in a second embodiment of the present invention.

Hereinafter, embodiments of the case-molded film capacitor of the present invention having the above configuration will be described in detail at the level of specific examples.

[First Example]
1 to 12 are related to the case-molded film capacitor of the first embodiment of the present invention, FIG. 1 is a perspective view showing a metallized film, and FIG. 2 shows a process of manufacturing a metallized film winding body. A perspective view, FIG. 3 is a cross-sectional view (a) of the film capacitor element and a perspective view (b) of the film capacitor element, FIG. 4 is a perspective view showing the film capacitor element unit, and FIG. A perspective view of a split state showing a lead-out terminal, FIG. 6 is a perspective view of a split state showing a film capacitor element unit and an upper external lead-out terminal, FIG. 7 is a perspective view showing a main part of a capacitor in an assembled state, and FIG. A perspective view showing an enlarged view of the tongue-shaped extending plate portion and the sandwiched tongue piece at the terminal, and FIGS. 9 and 10 are perspective views showing a state in which the main part of the capacitor is housed in the outer case (FIGS. 9 and 10). (The viewing direction is different), FIG. 11 is a perspective view showing a fixed state of the support pin on the pedestal portion in the outer case and the holding tongue piece at the external extraction terminal, and FIG. 12 is a mold in the outer case containing the main part of the capacitor. It is a perspective view which shows the state which the resin was solidified.

In these figures, A is the main part of the film, 10 is the film capacitor element, 10A is the film capacitor element unit, 11 is the first-wound film, 12 is the metallized film winder constituting the main body of the film capacitor element 10, 12A. Is a metallized film, 13 is a dielectric film, 14 is a metal thin film electrode, 15 is an exterior film, 16 is a metal electrode (metallikon) for electrode extraction, 17 is a plate-shaped external extraction terminal (bus bar), and 17A is an external extraction. The main body plate of the terminal 17, 17B is a tongue-shaped extension plate, 17a is the external connection terminal of the external extraction terminal 17, 17b is a small protrusion for connection, 17c is a cutout hole, 17d is an air vent hole, and 17e is. The recess, 17f is a pinching tongue piece, 17g is a cutout hole 17g, 18 is an exterior case, 18a is an opening of an exterior case 18, 18b is a vertical plate, 18c is a pedestal, 18d is a support pin, 19 is an epoxy resin, etc. It is a mold resin.

FIG. 1 shows the metallized film 12A which is the basis of the metallized film winding body 12 shown in FIGS. 2 and 3. As shown in FIG. 1, the metallized film 12A is formed by forming a metal thin film electrode 14 by depositing metal on one side (sometimes both sides) of the dielectric film 13. The edge region on one side of the dielectric film 13 is left as an insulating margin 13a (white portion), and the other region is a metal thin film electrode 14 (hatched portion). Two metallized films 12A and 12A are arranged to face each other so that the insulation margins 13a and 13a are located opposite to each other in the width direction, and they are overlapped in a state of being shifted in the film width direction as shown by double-headed arrows Y1 and Y2. .. At this time, the two metallized films 12A and 12A are overlapped with the metal thin film electrodes 14 and 14 facing the same direction (upward in the illustrated example) with respect to the film surface.

FIG. 2 shows the process of producing the columnar metallized film winding body 12. As shown in FIG. 2, the two metallized films 12A and 12A, which are laminated as shown in FIG. 1, are wound around the pre-wound film 11 in a roll shape. A moisture-resistant exterior film 15 is bonded to the winding end portion of the metallized film 12A, and the exterior film 15 is subsequently wound a plurality of times with respect to the outer peripheral surface of the winding end portion of the metallized film winding body 12.

As shown in FIG. 3, the metallized film winding body 12 is configured by laminating the metallized film 12A around the pre-wound film 11. A metal thin film electrode 14 is interposed between the overlapping portions of the films. As shown in the partially enlarged view (a1), a pair of adjacent dielectric films 13 and 13 that face each other in the radial direction and overlap each other with the metal thin film electrodes 14 interposed therebetween, and conversely, a pair that face each other in the radial direction and overlap each other. A dielectric film 13 is interposed between the adjacent metal thin film electrodes 14, 14. That is, the dielectric film 13 and the metal thin film electrode 14 are in a laminated state in which they are alternately repeated. The structure in which the dielectric film 13 is sandwiched between the pair of metal thin film electrodes 14 and 14 is a capacitor (storage) structure. The moisture-resistant exterior film 15 is wound around the outer peripheral portion of the metallized film winding body 12 a plurality of times, and is fixed by heat welding using a heat seal or the like. The heat welding is performed on the film 15 itself.

The metallized film winding body 12 may be formed as a laminated body in which a large number of rectangular metallized films are laminated in addition to the above-mentioned winding body.

Next, as shown in FIG. 3, the columnar metallized film winding body 12 is formed into a columnar body having an oval cross section. Then, on both end faces in the axial direction of the metallized film winding body 12, the metal electrodes (metallic capacitors) 16 and 16 are formed by metal spraying or the like while being connected to the metal thin film electrodes 14 and 14 between the overlapping portions of the dielectric film 13. It is formed and constitutes the film capacitor element 10. As shown in FIG. 4, a plurality of film capacitor elements 10 configured in this way are arranged in parallel in both the vertical and horizontal directions with their axial directions parallel to each other to form the film capacitor element unit 10A.

As shown in FIGS. 5, 6 and 7, in the film capacitor element unit 10A, external lead terminals 17 are attached to the metal electrodes 16 and 16 formed on both end faces in the axial direction (vertical direction) of each film capacitor element 10. , 17 are electrically connected. The main bodies of the external lead-out terminals 17 and 17 have a substantially rectangular shape, and the external connection terminal portions 17a and 17a are integrally bent from one of the short side edges on the free end side of the rectangle at a substantially right angle. It is connected. The external connection terminal portion 17a integrated with the lower external extraction terminal 17 is formed to be longer in the vertical direction than the external connection terminal portion 17a integrated with the upper external extraction terminal 17, and each end edge (upper end edge) is substantially formed. It is in the same position. In the case of the illustrated example, there are nine film capacitor elements 10 in the film capacitor element unit 10A, which are arranged in parallel in 3 rows and 3 columns. The external extraction terminals 17 and 17 are collectively connected to a total of nine film capacitor elements 10 in 3 rows and 3 columns, respectively.

The electrical connection between the external lead-out terminal 17 and the metal electrode 16 will be described. Here, the upper external lead-out terminal 17 will be described. The upper external lead-out terminal 17 is formed with connection holes 17c cut out in a penetrating state in a vertically and horizontally arranged state in a position corresponding to each film capacitor element 10 and leaving a small protrusion piece 17b for connection. .. At the position of the connection hole 17c, the small projecting piece 17b for connection is electrically connected to the metal electrode 16 of the film capacitor element 10 by resistance welding, soldering, or the like. The lower external drawer terminal 17 is also processed in the same manner as this, and has a small projecting piece 17b for connection and a hole 17c for connection.

Next, the air vent hole 17d formed in the external extraction terminal 17 will be described. Here, the upper external lead-out terminal 17 will be described. In the upper external lead-out terminal 17, the resin-filled space portion 10B (cross-sectional shape in which the four sides of the rhombus are arcuate inward) is formed between adjacent ones of a plurality of film capacitor elements 10 arranged in parallel in both the vertical and horizontal directions. A plurality of air vent holes 17d for allowing the air remaining inside the resin to escape to the outside are formed so as to correspond to the substantially central portion of the columnar body. The lower external lead-out terminal 17 is also processed in the same manner as this, and an air vent hole 17d is similarly present.

In the plurality of film capacitor elements 10, the metal electrodes 16 on the upper end side of each are located in the same plane, and the metal electrodes 16 on the lower end side of each are also located in the same plane. These two planes are parallel to each other. The upper external lead-out terminal 17 is joined to the metal electrode 16 group in one upper plane of the film capacitor element unit 10A, while the lower external lead-out terminal 17 is the lower side of the film capacitor element unit 10A. It is bonded to 16 groups of metal electrodes in one plane of.

As described above, as shown in FIG. 7, a plurality of film capacitor elements 10, that is, a film capacitor element unit 10A and a pair of metal electrodes 16 having a pair of metal electrodes 16 and 16 for drawing out electrodes formed on both end surfaces thereof. The main part A of the capacitor is composed of the external lead-out terminals 17 and 17 electrically connected to each of the 16th and 16th. Regarding the main part A of the capacitor, the number of the film capacitor elements 10 is arbitrary, and any plurality or singular number is included.

As shown in FIG. 9, the capacitor main portion A including the film capacitor element unit 10A and the pair of external extraction terminals 17 and 17 is housed in the outer case 18, and is injected and filled from the opening 18a of the outer case 18. It is coated with resin 19 (see FIG. 12). The coating of the capacitor main portion A by solidification of the mold resin 19 is a coating in a state where a part of the external connection terminal portions 17a and 17a on the free end side of the external extraction terminals 17 and 17 is removed.

In this embodiment, the structure for fixing the capacitor main portion A to the outer case 18 at the time of resin molding is configured as follows. As shown in FIGS. 9 and 10, the vertical side plate 18b constituting the peripheral wall portion of the exterior case 18 has an upper portion close to the opening 18a of the exterior case 18 integrally hook-shaped (terrace) toward the outside in the lateral direction. The pedestal portion 18c is formed by refracting the shape). The pedestal portion 18c is symmetrically provided at the same position of the pair of vertical side plates 18b and 18b that form the long side of the exterior case 18, and one vertical side plate 18b that forms the short side is provided from one corner. It is provided in a series in a series over the entire width up to the other corner. The pedestal portion 18c is an element on which the upper external drawer terminal 17 of the pair of upper and lower external drawer terminals 17 and 17 is placed and supported.
The direction along the long side (first direction) of the outer case 18 and the direction along the short side (second direction) are orthogonal to each other.

Then, as shown in FIG. 11, the pedestal portion 18c is provided with a support pin 18d so as to project upward in a posture perpendicular to the pedestal surface, which is the upper surface thereof, that is, in the opening direction of the exterior case 18. The pedestal portion 18c and the support pin 18d are integrally connected to the vertical side plates 18b and 18b which are the main body portions of the exterior case 18. The outer case 18 is made of a synthetic resin such as polyphenylene sulfide (PPS), and the entire outer case 18 including the pedestal portion 18c and the support pin 18d is integrally molded.

On the other hand, as shown in FIG. 8, the rectangular main body plate portion 17A of the upper external drawer terminal 17 has a tongue piece-shaped extension plate for being placed and supported on the pedestal surface of the pedestal portion 18c of the outer case 18. The portion 17B is integrally extended outward in the lateral direction (the surface direction of the main body plate portion). Recessed portions 17e and 17e that are recessed toward the center of the main body plate portion 17A are formed on both sides of the base portion of the tongue piece-shaped extension plate portion 17B, and the extension plate portion 17B is deformed in the vertical direction. I am improving my sex. A total of four tongue piece-shaped extension plate portions 17B are provided (see FIGS. 6, 7, 9, and 10).
Of the four extension plate portions 17B, the extension directions of the two extension plate portions 17B and 17B extending from the long side portion of the main body plate portion 17 are the first direction (short side direction). The two extension plate portions 17B and 17B serve as the first extension plate portion. Further, the extension direction of the other two extension plate portions 17B and 17B extending from the short side portion of the main body plate portion 17 is the second direction (long side direction), and the two extension plates The portions 17B and 17B serve as the second extension plate portion.

Then, as shown in FIGS. 8 and 11, the individual extension plate portions 17B have the support pin 18d protruding from the pedestal portion 18c in the projecting direction (vertical direction in this embodiment). A pair of sandwiching tongue pieces 17f and 17f that engage with each other while sliding along the line are provided. The pair of holding tongue pieces 17f and 17f are symmetrically formed by cutting out the extension plate portion 17B so as to be separated from each other so as to be able to sandwich the support pin 18d. The sandwiched tongue pieces 17f and 17f are movably configured by cutting out the sandwiched tongue pieces 17f and 17f in the extension plate portion 17B. An H-shaped cutout hole 17g is formed in the opposite portion of the pair of sandwiching tongue pieces 17f and 17f and the portion on both sides of each sandwiching tongue piece 17f so as to penetrate in the direction perpendicular to the plate surface and to be connected as a whole. .. A pair of holding tongue pieces 17f and 17f are formed by forming the cutout hole 17g into an H shape, which has a simple structure.

When accommodating the capacitor main portion A through the opening 18a from above the outer case 18, the plurality of extension plate portions 17B at the upper external extraction terminal 17 are brought close to the pedestal surface of the corresponding pedestal portion 18c. The pedestal surface extends perpendicularly to the surface direction of the vertical side plate 18b from the upper portion of the vertical side plate 18b forming the peripheral surface of the opening 18a of the exterior case 18. Then, a pair of sandwiching tongue pieces 17f, 17f facing each other in the extension plate portion 17B rises upward while sliding contact with the support pin 18d, and engages straight with the support pin 18d (see FIG. 11). That is, the pair of sandwiching tongue pieces 17f and 17f are in sliding contact with the outer peripheral surface of the support pin 18d and are deformed by the reaction force at that time to sandwich the outer peripheral surface of the support pin 18d. Immediately after this engagement, the lower surface of the extension plate portion 17B of the external drawer terminal 17 is stably placed and supported on the pedestal surface of the pedestal portion 18c. As a result, the upper external lead-out terminal 17 and thus the entire main part A of the capacitor are fixed to the outer case 18 in a strong anti-lifting state.

In this way, the capacitor main portion A is stably fixed in a state where the capacitor main portion A is prevented from floating in the outer case 18, and the mold resin 19 is injected and filled into the outer case 18 from that state (see FIG. 12). That is, a case mold mold in which the capacitor main portion A is covered with the mold resin 19 in the outer case 18 in a state where a part of the external connection terminal portions 17a and 17a on the free end side of the upper and lower external lead-out terminals 17 and 17 is removed. A film capacitor is obtained.

Then, the floating prevention mechanism of the capacitor main portion A against the buoyancy force of the mold resin 19 to be injected and filled cuts out the pedestal portion 18c provided in the outer case 18, the support pin 18d protruding from the pedestal portion 18c, and the external extraction terminal 17. It has a very simple structure compared to the conventional large-scale lifting prevention jigs of the holding tongue pieces 17f and 17f formed by the above, which is very advantageous in improving the productivity of the case mold type film capacitor. At the same time, it is possible to significantly reduce the manufacturing cost.

Further, the pair of holding tongue pieces 17f, 17f per one support pin 18d are not extended to the main body plate portion 17A of the external drawer terminal 17, but extend outward from the main body plate portion 17A, with respect to the main body plate portion 17A. It is formed in a tongue piece-shaped extension plate portion 17B having excellent mobility. Due to the presence of the recesses 17e and 17e formed on both sides of the tongue piece-shaped extension plate portion 17B, the extension plate portion 17B can be easily displaced in the vertical direction with respect to the main body plate portion 17A. Moreover, the sandwiched tongue pieces 17f and 17f are formed by cutting out the tongue piece-shaped extending plate portion 17B. The double deformation function of the holding tongue pieces 17f and 17f ensures that the main portion A of the capacitor is prevented from being lifted by the resin buoyancy in the outer case 18.

Further, the above-mentioned floating prevention mechanism that reliably prevents the main portion A of the capacitor from rising in the outer case 18 also has a function of strictly adjusting the height position of the external lead-out terminal 17 in the outer case 18 to a specified height position. It has and is effective in making the thickness of the resin covering the main part A of the capacitor uniform. As a result, the variation in the moisture resistance performance is suppressed, the moisture resistance is improved, and the manufacturing tolerance of the resin thickness is sufficiently reduced, which contributes to the miniaturization of the capacitor.

It is said that the external drawer terminal 17 is stably fixed to the outer case 18 by mounting it on the pedestal portion 18c on the tongue piece-shaped extension plate portion 17B for the double deformation function that ensures the prevention of lifting. It also has a function. This also works in favor of structural simplification.

In the above embodiment, the case where a plurality of film capacitor elements 10 are arranged in parallel in the film capacitor element unit 10A has been described, but the number of film capacitor elements 10 may be one, and the main capacitor may be one. The number of units of the part A may be one or two or more.

[Second Example]
FIG. 13 relates to the case-molded film capacitor of the second embodiment of the present invention, and shows another aspect of the sandwiched tongue piece 17f.

Four sandwiching tongue pieces 17f ... Are formed to form the sandwiching tongue piece 17f with the cutout hole 17g. That is, two pairs of the pair of sandwiched tongue pieces 17f and 17f formed so as to face each other are configured to be orthogonal to each other, and the two pairs of the pair of sandwiched tongue pieces face each other and the side portions of each sandwiched tongue piece. Is formed with a cutout hole 17g that penetrates in the direction perpendicular to the plate surface and is continuous as a whole. In this case, the four sandwiching tongue pieces 17f ... Are formed so as to face each other from four sides orthogonal to the support pin 18d, so that the external drawer terminal 17 is more firmly fixed to the support pin 18d and the pedestal portion 18c. It has become.

Other configurations and effects are the same as in the first embodiment.

The present invention is not limited to the above embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

For example, the pedestal portion 18c is formed so as to extend outward from the vertical side plate 18b of the outer case 18, but may be formed so as to extend inward from the vertical side plate 18b of the outer case 18. ..

Further, the position and number of the pedestal portions 18c are not limited to the above embodiment, and can be appropriately changed from the viewpoint of ensuring the positioning of the external lead-out terminal 17 with respect to the outer case 18 and the prevention of the main capacitor portion A from rising.

In the present invention, with respect to a case-molded film capacitor, when the resin thickness covering the main part of the capacitor is made constant to suppress variations in moisture resistance performance and improve moisture resistance, a large-scale lifting prevention jig conventionally used is not required. It is useful as a technology to improve productivity and reduce costs.

A Capacitor main part 10 Film capacitor element 16 Metal electrode for electrode extraction 17 External extraction terminal 17A Main body plate 17B Extension plate 17a External connection terminal 17f Holding tongue piece 17g Cutout hole 18 Exterior case 18a Opening 18b Vertical plate 18c Pedestal 18d Support pin 19 Mold resin

Claims (5)

A film capacitor element in which a pair of metal electrodes for drawing out electrodes are formed on both end surfaces, and a main part of a capacitor consisting of external drawing terminals electrically connected to each of the pair of metal electrodes.
An exterior case having an opening and accommodating the main part of the capacitor except for a part of the external connection terminal part on the free end side of the external lead-out terminal.
It is provided with a mold resin that is filled in the outer case and covers the main part of the capacitor except for a part of the external connection terminal part by solidification.
The exterior case is provided with a pedestal portion on which the external drawer terminal is placed and received, and a support pin projecting from the pedestal portion.
The external drawer terminal is provided with a plurality of holding tongue pieces that engage with the support pin and hold the outer peripheral surface of the support pin .
The outer case is open upward, and the pedestal portion extends perpendicularly to the surface direction of the vertical side plate from the upper portion of the vertical side plate constituting the opening peripheral surface of the outer case. has a base face, the support pins projecting from said base face upwards an opening direction of the outer case, the external lead terminals its underside Rukoto placed supported on the base face A featured case-molded film capacitor. The external extraction terminal is formed on a tongue piece-shaped extension plate portion in which a plate portion mounted and supported on the pedestal surface is integrally extended outward in the surface direction of the main body plate portion, and the tongue is formed. case molded film capacitor according the to claim 1 wherein the clamping tongue by cutout has been configured to the movable around clamping tongue in flake extension plate portion. The external drawer terminal extends in a second direction orthogonal to the first direction and a first extension plate portion in which a plate portion mounted and supported on the pedestal surface extends in the first direction. The case-molded film capacitor according to claim 2, which has a second extension plate portion that has been extended. The invention according to any one of claims 1 to 3, wherein the plurality of sandwiching tongue pieces are configured in at least a pair or more in a state of facing each other while being separated from each other to such an extent that the support pins can be sandwiched. Case mold type film capacitor. The case-molded film capacitor according to claim 4, wherein the plurality of sandwiched tongue pieces are configured such that two sets of the pair of sandwiched tongue pieces are orthogonal to each other.

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